Flashcards in Health and Disease Deck (21)
What is a communicable disease?
Diseases which can be passed on
What is a non communicable disease?
A disease that can't be spread.
What's a pathogen?
A microorganism which causes communicable diseases
What is MRS NERG
Key features of a virus
Can only reproduce inside living cell
Key features of bacteria
Double every 30 minutes
What is the lytic cycle?
•A virus attaches to a cell and injects genetic material
•The genetic material forms a circle
•New viral genetic material are produced
•The cell lyses (breaks open) releasing viruses
What is the lysogenic cycle?
•Virus attaches to cell and injects genetic material
•Genetic material forms a circle
•The circle inserts itself into the bacterial chromosome
•The bacterium reproduces and replicates
•Occasionally the viral genetic material separates from the bacterial chromosome and starts a lytic cycle
What are two problems of identifying causes for crop damage?
Different plants may show different symptoms to the same stress
Different stress may produce similar symptoms
How do plants protect themselves?
They have a waxy layer called the cuticle and bark which prevents pests/pathogens from getting to the plant
And if that doesn't work they have tough cell walls
What are some body defences?
Tears containing lycosine
White blood cells
What do lysozymes do?
Kill bacteria by breaking down their cell walls
Found in tears and mucus
How does the immune system work?
Cells and pathogens are covered in antigens. If a white blood cell detects a foreign antigen lymphocytes will create a matching antiBODY and bind to the antigen, killing it or marking it for destruction.
How do you calculate BMI?
Ebola- communicable or not?
What does a cardiovascular disease cause?
Blood vessels supplying the heart with oxygen and nutrients get blocked which can result in a heart attack.
What does smoking do?
Reduces blood flow to the heart during excercise. It means the heart can't pump hard enough to deliver blood to the muscles.
What's an autoclave?
A machine that heats agar to sterilise it.
What can alcohol cause?
A liver disease (cirrhosis)
What does HIV do?
Attacks white blood cells and causes AIDS.